linux-kernel - Re: [RFC 4/9] Atomic reclaim: Save irq flags in vmscan.c

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Pine.LNX.4.64.0708141425000.31693@schroedinger.engr.sgi.com>
Date:	Tue, 14 Aug 2007 14:26:43 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andi Kleen <andi@...stfloor.org>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 4/9] Atomic reclaim: Save irq flags in vmscan.c

On Tue, 14 Aug 2007, Andi Kleen wrote:

> > So every spinlock would have an array of chars sized to NR_CPUS and set 
> > the flag when the lock is taken?
> 
> I was more thinking of a single per cpu flag for all of page reclaim
> That keeps it also cache local.

We already have such a flag in the zone structure

        /* A count of how many reclaimers are scanning this zone */
        atomic_t                reclaim_in_progress;


The problem is that the LRU lock etc is also taken outside of reclaim. In 
order for the flag to work we would have to set it everywhere the lru lock 
etcis taken.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/